<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>

    <style>
        .outer {
            width: 400px;
            height: 400px;
            background-color: gray;
            text-align: center;
            line-height: 400px;
        }

        span {
            background-color: orange;
            font-size: 20px;
        }
    </style>

</head>
<body>

    <div class="outer">
        <span>出来玩</span>
    </div>
    
</body>
</html>